Grating structure



Sept. 29, 1936. R. P/PENNOYER GRATING STRUCTURE Filed Feb. 6,

Patented Sept. l29, 1.936

UNITED STATES PATENT OFFICE GRATING STBUQ'IUBE Raymond P. Pennoyer, Pittsburgh, Pa. vApplication Febrllll'y 0, 1934Serlal No. 710,025

8 Claims.

This invention relates to a grating structure. and more particularly those suchA as are used for reenforcing flooring for bridges, and thelike,

In structures of this type, the grating is usually :made of metal, and is illled with concrete, or-

other. material. In the past, the steel grating structure has generally been usedonly for com-l will increase the efliciency of the steel of the grating by stressing it higher than heretofore possible, and one which will, at the same time, Amake possible lower stresses inV the concrete, or

other lling aterial.

These and further objects will be apparent after referring to the drawing, in which: Y

Figure 1 is a plan oi the device of the invention.

` Figure 2 is a sectional View onthe line II-II of Figure 1.

Figure 3 is a sectional view on the line III--III of Figure 1.

Referring more particularly to the drawing, the base members ofl grating structures of the type described are usually referred to as girders".

and in the present instance are in the form of inverted Ts having webs 2 and flanges 3. A plurality of inverted Ts are assembled in parallel relationship, and each provided on its upper edge with a plurality of slots I, which are'curved, inclined, or otherwise deformed in cross-section. The slots 4 of adjacent webs 2 are in exact transverse alinement with respect to the longitudinal axes of the girders.

A plurality of transverse bars 6 are each provided with curved portions, or nibs, 1, at spaced intervals, for seating inthe various slots I in the girders. The webs of the transverse bars 8 are of such width that when seated in the slots 4 they extend substantially upwardly from the edges of vthe girders. The transverse bars l are 45 intended to support a plurality of cross-bars which are securely attached thereto, preferably' by interlocking. Accordingly, the upper edges of the transverse bars 6 are provided with a plurality of curved, or inclined, slots B.

The cross-bars, which are indicated at l, are each provided on their lower edges with spaced nibs I0 which conform substantially to the crosssection of the slots 8, and are adapted to seat in the same in such manner as to permit their upas those of the transverse bars C.

permost edges to lie in the same horizontal piane (ci. lss-faz) While I have shown and described one specific embodiment of my invention, it will be understood lthat I do not wish to be limited exactly thereto, since various modications may be made without departing from the scope of my invention, as defined in the following claims.

I claim:

l. A grating structure comprising a plurality of longitudinal girder bars having slots formed in their upper edges, transverse bars seated in said slots and extending vertically out of they same, said transverse bars having slots formed in their upper edges, and cross-bars seated in said last named slots.

2. A grating structure comprising a plurality of longitudinal girder bars having slots formed in their upper edges, transverse bars seated in said slots and extending vertically out ofthe same, said transverse bars having slots formed in their upper edges, and cross-bars seated in said last named slots, the upper edges of said cross bars being in substantially the same longitudinal plane as those of said transverse bars.`

3. A grating structure comprising a plurality of longitudinal girder bars having inclined slots formed in their upper edges, transverse bars having inclined nibs for seating in said slots, said transverse bars extending vertically out of said slots and having inclined slots formed in their upperl edges, and cross-bars having inclined nibs for seating in'said last named slots.

4. A grating structure comprising a plurality of longitudinal girder bars having inclined slots formed in their upper edges, transverse bars having inclined nibs for seating in said slots, said transverse bars extending vertically out of said slots and having inclined slots formed in their upper edges, and'cross-bars having inclined nibs for seating in said last named slots, the upper edges of said cross-bars being'in substantially the same horizontal plane as those of said transverse bars.

5. A grating structure comprising a plurality of longitudinal girder bars having slots formed in their upper edges, transverse bars seated in said .slots and extending vertically out of the same, and cross-bars supported by said transverse bars.

6. A grating structure comprising aplurality of longitudinal girder bars having slots formed in their upper edges, transverse bars seated insaid slots and extending vertically out of the same, and cross-bars supported by said transverse bars and adapted to have their upper edges lie in substantially the same horizontal plane as those of said transverse bars.

RAYMOND P.`PENN0YER. 

